Samsung Galaxy Watch4 User Manual page 8

Getting started
CAUTION The charging head for plugging the USB cable into a wall outlet is not
included. Use only Samsung charging devices rated with an output voltage of 5v
and an output current of over 150mA (sold separately). Samsung accessories are
designed for your device to maximize battery life. Using other accessories may
void your warranty and may cause damage.
NOTE Prevent the USB charger port and the small end of the charger cable from
coming into contact with conductive materials, such as liquids, dust, metal
powders, and pencil leads.
While charging, the device and the charger may become hot. This does not affect
the device's lifespan or performance and is in the device's normal range of
operation.
Remove the device from the charger and wait for the device to cool down. For more
information, visit https://www.samsung.com/us/support/answer/ANS00076952.
NOTE Do not disassemble, modify, or repair your device. Placing objects, such as
magnetic stripe cards, including credit cards, phone cards, passbooks, and
boarding passes, next to the device or charger may cause damage from the
charger or device's magnetic field.
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